1221441331 has 8 divisors (see below), whose sum is σ = 1333322928. Its totient is φ = 1109700000.

The previous prime is 1221441307. The next prime is 1221441341. The reversal of 1221441331 is 1331441221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221441331 - 2¹⁵ = 1221408563 is a prime.

It is a super-2 number, since 2×1221441331² = 2983837850150103122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221441341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16420 + ... + 52081.

It is an arithmetic number, because the mean of its divisors is an integer number (166665366).

Almost surely, 2^1221441331 is an apocalyptic number.

1221441331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221441331 is a deficient number, since it is larger than the sum of its proper divisors (111881597).

1221441331 is a wasteful number, since it uses less digits than its factorization.

1221441331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70133.

The product of its digits is 576, while the sum is 22.

The square root of 1221441331 is about 34949.1248960543. The cubic root of 1221441331 is about 1068.9503582689.

Adding to 1221441331 its reverse (1331441221), we get a palindrome (2552882552).

The spelling of 1221441331 in words is "one billion, two hundred twenty-one million, four hundred forty-one thousand, three hundred thirty-one".